Right now I have a betta in a bowl. The bowl is about a gallon, and the betta seems happy. I'm feeding him flakes and blood worms. Is he ok? Do I need a bigger tank for him? My apartment is fairly warm, so he seems to do ok without a heater, but should I get one? I don't want to be cruel to this beautiful fish...I originally had him in my 20 gallon tank with tetras and mollies but he was TERRIFIED of them and would hide all day. For a week he didn't eat, didn't come out of hiding. One day he finally swam up to eat and then another fish about his size swam up to him and he freaked out and hid again. I thought bettas were supposed to be agressive! I took him out and for the past two months he has been eating and seeming to do fine. I am rather attached to him, I've named him Leo after Leo the Cowardly Lion in the old disney cartoon. I really want him to be happy. Getting a ten gallon tank for him seems excessive- will a 1 1/2 gallon or even a five gallon do?